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Title

Nitrogen-doped carbons prepared from eutectic mixtures as metal-free oxygen reduction catalysts

AuthorsLópez‐Salas, Nieves; Gutiérrez, María C. ; Ovín Ania, María Concepción ; Muñoz, Miguel A.; Ferrer, M. Luisa ; Monte, Francisco del
Issue Date14-Jan-2016
PublisherRoyal Society of Chemistry
CitationJournal of Materials Chemistry A 4(2): 478-488 (2016)
AbstractDeep eutectic solvents (DESs) composed of resorcinol, either 2-cyanophenol or 4-cyanophenol, and choline chloride were used for the synthesis of hierarchical nitrogen-doped carbon molecular sieves. Carbons were obtained with high conversions by polycondensation of resorcinol and either 2-cyanophenol or 4-cyanophenol with formaldehyde, and subsequent carbonization at 800 °C in nitrogen atmosphere. The nitrogen content was ca. 2.4 wt%, revealing an excellent nitrogen-doping efficiency for cyanophenol derivatives when used in the form of DES. The use of either 2-cyanophenol or 4-cyanophenol modified the contribution of quaternary-Nvalley groups in the resulting carbons, being larger in carbons coming from 4-cyanophenol than in those coming from 2-cyanophenol. The hierarchical porous structure was composed of micro-, meso- and macropores, and the diameter distribution of mesopores was also related to the use of either 2-cyanophenol or 4-cyanophenol. These structural and compositional differences were critical for the use of the resulting hierarchical nitrogen-doped carbons as efficient metal-free electrocatalysts. In particular, the carbons coming 4-cyanophenol proved particularly effective in the direct reduction of oxygen to OH− (H2O in acidic solution) through a four-electron (4e−) process with high catalytic activity and selectivity, and longer stability and stronger tolerance to crossover effects than platinum-based electrocatalysts.
Publisher version (URL)http://dx.doi.org/10.1039/C5TA08630B
URIhttp://hdl.handle.net/10261/131459
DOI10.1039/C5TA08630B
ISSN2050-7488
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